Neckarsulm is a city in northern Baden-Württemberg, Germany, near Stuttgart, and part of the district Heilbronn. As of 2004, it had 27.296 inhabitants. The rivers Neckar and Sulm join there, hence the name, which is often misunderstood or mispronounced as "Neckar's Ulm", which would mean the Neckar "version" of Ulm which is located at the Danube. The former NSU Motorenwerke AG are located here, nowadays belonging to Audi. The Audi Aluminium Plant quattro GmbH is located here, not in Ingolstadt. Neckarsulm is also very famous for being ranked first in the German Solarbundesliga (cities beginning at 10 000 inhabitants), a competition in installation of renewable energies.